Attachment for locomotives



July 1. 1924. 1,499,637

R. W. BRADEN ET AL ATTAQHMENT FOR LOCOMOTIVES Filed March 7-. 1923 July1, 1924. 1,499,637

R. W. BRADEN ET AL.

ATTACHMENT FUR LOCOMOTIVES Filed March '7. 1923 9 Sheets-Sheet 3 w m fmMv, m ma m n. WM

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July ll 1924. 1,499,637

R. W. BRADEN ET Al.

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- R. W. -BRADEN ET AL ATTACHMENT FOR LOCOMOTVES Filed March '7. 1923 9Sheets-Sheet 6 5311;. e a E.

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ATTACHMENT FOR LOCOMOTIVES Filed March 7, 1923 9 Sheets-Sheet '7 July`1, 1924. 1,499,637

R. W. BRADEN ET AL ATTACHMENT FOR LOCOMOTVES Filed March '7. 1923 9Sheets-Sheet 8 July 1 1924.

R. W. BRADEN ET A ATTACHMENT FOR LOCOMOTIVES 9 Sheets-sheet 9 FiledMarch '7. 1923 TO DOME Patented July 1, 1924.

U iT

i Leann RICHARD w. RRADEN, or NEW YORK, n. Y., Ann CHARLES STERN, orJERSEY CITY,

NEW JERSEY, ASSIGNORS TO B. & S. MANUFACTURING PRDDUCTS" CORPORATION, 0FJERSEY CITY, NEWVJERSEY, A CORPORATION O'F NEW JERSEY.

ATTACHMENT' FOR LOCOMOTIVES.

Application filed March 7, 1923. Serial No. 623,525;k

To all whom t may Concern.'

Be it known that we, R101-IARD W. BRADEN and CHARLES STERN, citizens ofthe United States, residing at the borough of Manhattan, in the county,city, and State of New York, and Jersey City, in the county of HudsonandState of New Jersey, respectively, have invented certain new and usefulImprovements in Attachments for Locomotives, of which the following is aspecification.

The present invention relates to improvements in attachments forlocomotives in which provision is made for supplying steam to .valvechests and cylinders whenever a locomotive is drifting or 'being towed;and the invention resides more particularly in a compact control piececarriedvby the locomotive and which may have communication with both ofthe valve chests and with a source of steam, in which device areassociated and arranged a valve and its controlling means operated uponby the presence and absence of steam in` the valve chests.

Other objects of the invention are to accomplish the supply of steam tothe valve chests and cylinders of a locomotive in order to keep theparts at running temperature,

and to break any vacuum tending to form therein when the locomotive isin motion with the throttle closed and to effect this supply of steamfaithfully and in suiiicient v same.

With the foregoing and other objects in view, the invention will be morefully described hereinafter, and will be more particularly pointed outin the claims.

In the drawings, ,wherein like symbols Y refer to like or correspondingparts throughout the several views: v Y Figure 1 1s a bottom :plan viewyof a device constructedjaccording to the present inveni tion;

indicated in Figure 5; Y

`r'Figure 2 is a top plan view of the same; Figure 3 is a longitudinalsection taken through the control cylinders'on'the line 3 3 in Figure 9;i

Figure 4 is a transverse section taken centrally through the device;

F .'gure 5 is a diagram showing the position of the pistons withreference to the valve when the latter is in a closed position,

Figure 6 is a fragmentary plan ,view showing the position of the valveoperatingpconnections when the pistons are in the position Figure 7 isalso a diagrammatic `view simi-y lar to Figure 5 but showing the pistonsin a subsequent position with the -valve open;l

Figure 8 is a view similarv to Figure 6 with the connections in aposition corresponding withthis movement of the valve;

Figure 9 is a cross section taken `centrally through the device ontheline 9 9 `in F igure 3 and illustrating the main casting with the valveparts and connections removed ;y

Figure 10 is also a transverse section taken through the casting` at thelarger cylinder on the line 10-10 in Figure 2 with .the valve removed; 3

Figure 11 `is a ylongitudinal section taken through the relief valve onthe lineVll--ll I in Figure 2; f

Figure 12 is an end view of one vof .the valve shoes; w. -l

Figure 13 is a section taken on a small scale on the line 13-13 inIFigure 2, the relief valve being shown in elevation;

Figure 14 shows partial front view of a locomotive with' theimproved'device installed thereon and coupled with thevalve chests, andK' Figure 15 is a side view ofthe same.'

Referring more particularly to the drawings the device comprisesgenerally a casing in the lower central portion of which isa cylinder 12which is'in communication with a source of steam through a passage 13shown 'in Figure 10 and .having screw threads by which a steam pipe maybe coupled thereto. This steam passage is shown in Figure 9 ascommunicatingl ,-with. the cylinder 12 by means of a port lllisthroughone ofthe vertical walls of thecasing. The lateral `walls 15 and 16 ofthe `cylinder 12 are shown as provided with ports 17 and ,18

respectively, whereby the interior of the cylinder may be placed incommunication with the valve chests of the locomotive on which thedevice is ,placed by conduits from 21 and 22; the object beingto supplysteam, with which the cylinder is at all times supplied, for instancedirectly from the boiler to the valve chests and cylinders of thelocomotive in order to break any vacuum tending to occur therein whenthe throttle is closed and the locomotive moving `and further to cushionthe reciprocating parts and keep the surrounding metal at runningtemjerature.v The ports 17 and 18 just referred to are shown as opening'outwardly upon channels 19 and 20 which rise vertically from the portsand have lateral outlets threaded as indicated at 21 and 22 to receivepipes by which the channels and the cylinder are in communication withthe opposite steam chests ofthe locomotive, it being understood that adesirable location for the present device is between the steam chestsand the saddle will probably provide the most convenient place on whichto install said device.

The ports V17 and 18 are normally closed by valve shoes `24 and 25 whichare shown as carried within `recesses made within the valve block -26which is journaled for `circular movement upon ya vertical axis withinthe cylinder 12. The valve shoes 24 and 25 are urged outwardly by a coilspring '27 shown as Vextending lthrough passage 2S made centrallythrough lthe block 26, the ends Vof the spring engaging in sprockets 29and -30 'in the "inner faces'of the valve shoes. The pressure of steam-in the cylinder 12 against the corners ofthe valve shoes lpresses thevalve 'shoes ytightly against the vwall of the cylinder 12. In this waythe shoes are kept in close contact with the segments 31 and.32A(Figures-5 and 7 z) yprovided on the interior wall of the chamber toreceive the outer edges ofthe valve shoes which are outlet 39 forcondensed steam. This outlet may be provided with any 'suitable conden;sation check valve. Y

The steam 'received from the boiler 'into the cylinder 12 is preventedfrom escape while the valve shoes are in the position in- Y dicalted inFigure '5, but'when the block and the shoes are in the vopen positionillustrated in Figure 7 the steam may escape through the ports and tothe valve: chests and cylinders of the `locomotive through the system ofpassages already described.

Vile Aprovide in conjunction with the valve an apparatus automaticallycontrolled for shifting this valve to the open or closed position, andthis movement of the valve is intended to bear a definite relationshipto the closed and open positions of the throttle. n other words when thethrottle is open steam is being delivered to the valve chests andcylinders as during Athe normally running of the locomotive, then'thevalve should be closed to avoid any interference of the steam. However',when the engineer closes the throttle and allows the locomotive to coastor drift or when the locomotive is being towed, it is desirable to havea supply of steam delivered to the valve chests and to the locomotivecylinders. We, therefore, provide a control device in conjunction withthe valve for movingl this valve in accordance with conditions withinthe steam chests. This device is described as follows zM The top 40 ofthe cylinder 12'may be provided with a cylindrical -bore 41 which may bereinforced by enlargements above and below` as shown in Figures 4 and 9;and in this bore there is shown as mounted the cylindrical enlargedintermediate portion 42 of a vertically disposed turning post. Theturning post is shown as having a squared upwardly projecting stud 43and a reduced and` squaredvlower stud 44 projecting into the cylinder 12and rinto a recess 45 made in the upper surface of the block 26 which isalso shown assquared to correspondingly fit Vsaid stud. A shoulder 46 isshown as provided 'upon lthe turning post just beneath the cylindricalpart and as having a rounded 'bearing 47 ltaking against 'the under sideof the cylinder'top :40.

A curved `armr48 is 'shown as connected with the top stud 43 of theturning post as by being provided with a 'square Vsocket' 49 to receivethe stud. The varm is shown as confined Vupon the stud by a nut 50. Thearm is shown as curved upwardly and away from Ithe turning post and asslotted at its upper end, as indicated 'at 51, the length of the slotbeing radial with respect to the axis'of the turning post. The slot is'slidinglyoccupied by a downwardly projecting stud 52 shown as mountedupon one end of the arm 53 which may be rounded at its intermediateunder side, as represented at 54, in order to snugly lfit upon thepiston rod 55, to which it is shown 'as secured as by the screw 56lthreaded into Vsaid piston rod. The `other end of the arm is shown asresting slidingly upon a guide 57 which may be a part of the casing.Y KY The movement 'of the arms '48 and 53 is shown in Figures 6 and 8.

llO

In Figures 3, 5 and 7 `the piston rod is shown as made up of large andsmall diameters having, pistons 58 and 59 coupled rigidly to theopposite ends thereof and shown as provided with a frustoconical valveface 60 at the intersection of the large and small diameters of thestem, which valve facing is adapted to cooperate with and close againsta similarly formed valve seat 61J the reduced portion ofthe pistonhaving a rather loose lit in the head 62 of a comparatively largecylinder 63. In this large cylinder 63 fits the piston 59 being also ofcomparatively large diameter. The companion piston 58, at the other endof the piston rod 55, is similarly mounted to re-v ciprocate in anopposed cylinder 64 which is of smaller' diameter compared to thecylinder 63. The remote or far end of the cylinder 65 made in the shellor casing is closed as by a head 66 secured removably by the bolts orother fastenings 67 which enable the head to be taken off and access hadto the interior of the chamber 65 and to the end of the piston rod.

The chamber 65 is shown as communicating bywa passage 68 in the casingand eX- tending longitudinally thereof with the other cylinder 63, inthe side wall of which is shown a port 69 adapted to communicate withthe cylinder 63 except when the piston covers said port. The port 69 isshown as communicating with the passage 68 through a check valvecomprising a cage 70 threaded as indicated at 71 into an appr priatepart of the casing and as being hollow and communicating interiorly withthe port 69. A valve 72 is shown as mounted to reciprocate within thecage and to close normally against a seat 73 against which it is urgedas by a coil spring 74 wound about the stem 75 which carries said valve72. Guide wings 76 are shown as extending beneath the valve and asjournaled in the cylindrical part 77 of the cage, while the. outer endof the stem 75 may slide freely in a removable cap 78, by unscrewingwhich,

the valve assembly may be removedthrough t-he outer end of the cage..The interior space of said cage beyond the valve 7 2 is shown asprovided with ports 79 through which steam may pass into the passage 68.There is shown a dome cap 80 having,v a threaded shank secured removablyinto a threaded opening 81 made laterally through the casing wall andentering upon the passage 68, the shank of the dome cap being shown asgreater in diameter than the valve casing in order to provide an annularpassage for the free transference'of steam between these parts. Y

The chamber 65 which communicates with the passage 68 andwith the remoteend of the cylinder '64 is shown as ported as indicated at 82 to receivethe relief yvalve shown k-orr exceeds, that in the cylinder 63.

in Figures 11 and 13. This relief valve is shown as comprising a shell83 having a reduced and threaded shank 84 at onel end adapted to takeinto said opening or port 82of the chamber 65. In the shank 84 a. bore85 is shown slidingly receiving the cruciform guide 86 upon the innerend of the valve body 87 which is adapted to take against the conicalseat 88 provided at the outer end of the bore, said valve body hav-V inga correspondingly formed face to act as a complementto this seat 88. Theshoulder part 89 of the valve body is shown as provided with an inwardlyturned rim 90 adapted to cooperate with the raised interior surface orshoulder 91 Within the Vbase of the shell 83 to avoid rocking or cantingof the valve body such as would result in the casual shifting of thebody to one side away from its seat. These parts cause `the body to movein equally Vas to all circumferential parts of the seat and to thereforeeffect a tight closure. The shoulder 89 is also useful to form anabutment for the inner end of a coil spring 92 which is shown.

as received at its outer end against a screw plug 93 adjustably threadedinto an opening 94 in the outer portion of the shell. The plug may beprovided with a squareor other appropriately shaped stud 95 to readilytake a wrench or other implement for effecting the adjustment, orremoving or replacing the plug. y

The valve 72 is merely a check valve opening in one direction only andclosed-whenever the pressure in the chamber 65 equals, The spring 74aids the valve 72 in closing and is an aid to the closing of the valveby the i steam pressure act-ing on the outer larger area of said valve.

over, but this valve will not blow all of the time the locomotive isrunning because the piston 58 cuts off the relief valve port 82 from thechamber 65'while the throttle is open. See Figure 5.

As shown in Figures 5 and 7 vand also.

as indicated in dotted lines in Figure 3, the vertical passages 19 and20 at lthe side of the cylinder 12 communicate with horizontallyextending passages 96 and 97, which are shown as terminating in thelarge cylinder 63 through ports 98 and 99 respectively.v Such outer endof the cylinder is'shown in Figure 3 as closed by a removable head 100lsecured in place by the bolts or other fas-r tenings 101.

As shown in Figures 5 and 10 another port 102 entersthe largecylinder-63 atan intermediate portionand this port is shownascommunicating withthe' passage 97. A needle valve 103 may be arrangedto cooperate with a seat 104 at the end of the port 102 V.adjoining thepassage 97, this needle valve being shown as threaded at. 105 in Figures5 and 7 in the outer shell wall and as being protected by a surroundingsocket 106 allowing the end ot the needle to be adjusted. Or a plug maybe removably secured into the outer end of the shell at this point asdesignated at 107 in Figure 10. The plug may be removed tor cleair ingout the port 102.

The device is shown as provided with a base 108 and 109 havingperforat-ions 110 by whichl the device may be secured to the saddle of alocomotive or other appropriate part. It Will be noted that the cylinder12 is shown as occupying the center loiver portion ot the casting andthat the cylinders 63 and 6'1 are Vshoivn as raised above the cylinder12 and as located at the end portions ot the casting vin order that theymay the. better cooperate with the pin bv which the valve in thecylinder 12 is moved.

`When the engineer opens the throttle to start the locomotive steam tromone ot the steam chests enters at the passage 20 and thence tlovvsthrough the passage 97 to the cylinder 63. Steam trom the other steamchest enters at thepassage 21 and thence flows through the passage` 96to the Vcylinder 63. Steam trom the cylinder forces the piston 59 over.lVhen the piston 59 which is larger than the piston 58) is forced oversteam trom the cylinder 63 enters the passage 69 and the valve72 isopened. Vhen the valve 72 is opened steam may pass into the passageY 68and thence into the chamber 65. The device Will remain in this positionvuntil the throttle is shut ott. lVhen the throttle is shut off steamfrom passage G8 presses against the larger area oit the valve 72 closingthe valve 72. The spring in the valve 72 also tends to hold the valve 72closed. 'Vhen the valve 72 is closed no more ksteam can pass through thepassage 68 into the chamber 65. Also when the valve 72 closed the steamivill be held in the chamber The pressure of steam in the chamber65against the piston 58 Will torce the piston 58 over due to reduction otpressure in cylinder 63. As the piston rod 55 moves over to right asshown in Figure 3 it carries over with it `the arm 53. r1`he movement otthe arm e8 causes the turning post to turn and as this turning post isconnected with the shut ott block liolderthe valve shoes 24 and 25 arecaused to move and thereby the ports 17 and 18 are opened up. `vWhenlthe port 17 is opened steam trom the cylinder 12 may enter the passage19 and trom the passage 19 through 21 to one of .the steam chests. rlheopeningY of the port 18 permits steam trom the cylinder 12 to enter thepassage 20 and from the passage 20 steam may go through 22 to the othersteam chest.

Inits movement the piston rod 55 carries with it the piston 59. Vhen thepiston 59 is moved over sutliciently tar the port 102 Will be in frontof the piston 59 and steam from the cylinder 12 Will enter the passages17 and 18, 19 and 20, 97 and 96, and trom the passage 97 will enter theport 102 and thence that part oit the cylinder 63 which is in front otthe piston 59. In this position the valve tace 60 Will impinge againstthe valve seat 61 and prevent the escape ot steam at that point, butsteam trom the part ot the cylinder 63 which is in trent oit the'piston59 may enter the passage 69 and raise the valve 72 and steam may thenenter the passage 68v and go into the chamber 65 and thence intocylinder 64;.

The port 102 thus furnishes steam to the chamber 65 While the locomotiveis moving with the throttle closed in order to maintain the necessarypressure against the outer tace oi the piston 58; rfhis is essential inordei that the shut-ott blocks may be held in the constant open positionshown in Figure 7.

W hen the pressure ot' steam in the cylinder 611 and chamber 65 exceedsthe pressure ot the spring 92 oiE the reliet valve in the opening 82 theexcess pressure ot steam will open the valve termed by the seat 88 andthe complementally formed tace 83;L and may be discharged through holesin the plug 93.

Then the engineer closes the throttle thc pressure ivill imniediately'fall in the outer end ot cylinder 63 and the operation and position otthe parts for drifting or When the locomotive is being towed are as totlows The falling ot the pressure in cylinder 63 enables the accumulatedpressure in chamber l65 to torce the pistons 58 and 59 over totheposition shoivn in Figure 7.

In this position ot the Vpiston 58 the relief valve port 82 in cylinder64 is exposed `al lowing all the steam in chamber 65 to escape exceptsay live pounds it the relief valve has been adjusted at tive pounds.This live pounds pressure in the cylinder 611 is sul'licient to hold thepiston 58. naddition the pressure in the cylinder 63 between the head 62and the piston 59 also holds the piston 59 and with it the piston rod55, and piston 58 in the relative position shown in Figure 3. When theparts are as shoivn in Figure 3 or F igiire 7 the shut-ott blocks 24 and25 are open and steam trom the central'cylinder 12 may enter thepassages 97Y and 102 and enter the inner portion ot the cylinder 63.Steam from the cylinder 63 also presses into the passage 69 and raisesthe seat 72 permitting steam'to tloiv through passage 68 into thechamber 65, and when it gets to the chamber 65 the surplus pressureabove sayvthe l'ive pounds is bloivn out through the relief valve.

y`When the locomotive is being brought to a stop steam from the steamchests backs up through 22 and 21 and enters 19 and 20, and thence goesto 97 and 96 and into cylinder 63 striking behind the piston 59 andforcing the piston 59 over to the left as shown in Figure 5. The valveface 60 being then raised from the valve seat 61 any steam in thecylinder 63 between 62 and piston 59 will be forced to exhaust. Thismovement of the piston 59 to the left causes a movement of the piston 58in the same direction and the discharge of steam through the reliefvalve. port 82 will be shut off and such steam as remains in the chamber65 lmay condense. A suitable port such as 112, shown in Figs. 1 and 3may beprovided to care for the condensed steam. When the piston 59 movesto the left carry- 'ing with itthe piston rod the shut off block shoeswill close the ports 17 and 18, thereby shutting olf the steam fromcylinder 12.

Referring to Figure 12 the valve shoes are shown as substantially squareor having Acorners 24 exposed to the steam pressure within the cylinder12, whereby this pressure acts to press the shoes tightly against thewall of cylinder 12 and avoids the escape of steam when the valve shoesare in the position indicated in Figure 5.

Referring more particularly to Figures 14 and l5, 200 designatesgenerally a locomotive having the cylinders 201 and the valve chest 202`carried by the saddle 203 in accordance with the usual practice. Thelocomotive steam supply pipes are indicated at 204. The improved deviceis shown as mounted on a bracket 205 bolted or otherwise aixed to thesaddle and projecting forwardly therefrom toward one side of thelocomotive. The pipes 206 and 207 are coupled to the ports 21 and 22 asshown in Figure '9 and these pipes extend to the valve chests 202. Apipe 208 extends Jfrom the steam dome to the connection 13 as shown inFigure 10. The pipe 209 is a drain pipe extending from the port 112 asshown in Figure 1. Obviously other modes of connection might be adopted.

Itis obvious that various changes and modifications may be made in thedetails of construction and design of the above speciiicially describedembodiment of this invention without departing from the spirit thereof.

What we claim is 1. A locomotive attachment comprising a casingcontaining a chamber in connection .with a source of steam supply andwith the locomotive steam chests, valve means in said chamber foropening and closing the communication between'the chamber and the valvechests, valve-actuating means'having opposite faces of differential areaexposed to the steam from the steam chest whereby such steam may duringthe normal tra running of the locomotive with the throttle open shiftsaid valve-actuating means to close the valve means and shut off thecornmunication between said chamber and the steam chests, the steampressure against the larger area of said valve-actuating means adaptedto fall when the throttle is closed and when the vsteam chest pressure`falls,

and means fortrapping the steam onl the face of said valve-actuatingmeansy having the smaller area whereby to cause shifting in the-oppositedirection of the valve-actuating means when the steam is cut off fromthe valve chests and a consequence opening of said valve. o A v f2. Alocomotive attachment comprising a casing connecting with a valve chestof a locomotive and with a source 'of steam supply, valve means in saidchamber to open and close the communication with the valvechest,cylinders adjoining said casing of unequal diameters, pistonstherein coupled for uniformvmovement, the largerecylinder at its outerend having communication with the valve chest, said lcasing having apas-` sage between said cylinders Vfor allowing the steam in the largercylinder to pass to the smaller cylinder and to press upon oppositefaces of said pistons, means to-r trap steam in the cylinder having thesmaller diameter to open theA valve means, and a coupling between saidpistons and said valve means.

3. A locomotive attachment comprising a casing, having cylinders thereinof differential diameter` in communication atxtheir outer ends, thelarger cylinder at its outer end adapted to receive steam from the valvechests of a locomotive, means to permit the flow of such steam'from thecylinder Vof larger diameter to 'that of the smaller `diameter butpreventing a return ow of such steam, pistons in said cylinders, meansYto rigidly connect said pistons', a chamber in said casing incommunication with a source of steam supply and having connection withthe steam chests, a valve to control this connection, and connectionsbetween said valve and said means for connecting the pistons.

4. An attachment for locomotives having a source of `steam and a steamchest comprising a casing connected with the source of steam and thesteam chest having cylinders therein of unequal diameters, con- Y nectedpistons in said cylinders, the larger cylinder being in connection atits outer end with the yvalve chest, the remote ends of the cylindersbeing in controlled lcommunication, means opened by the movement of thepistons in one direction to cause steam from said source to be deliveredto the valve chest and closed upon the opposite movement of the pistons,said casing having a passage to .deliver ysteam to-the proximate end ofthe larger cylinder when CIK the piston is in the outer end thereofwherer byto retain the pressure in the smaller cylinder.

"5. A locomotive attachment comprising a casing having a large and asmall cylinder, pistons therein, a rod connecting said pistons forsimultaneous movement, said casinghaving a passage connecting the remoteends of the cylinders, a valve in said passage permitting flowV onlyfrom the larger to the smaller cylinder, the remote end of the largercylinder receiving steam from the steam chests of` a locomotive, achamber in the casing for vsteam having connections to the valve chestsof the locomotive, valve means coupled to said piston rod and adapted toclose the communication of the chamber with the valve chests when steamis present in the valve chests, said chamber also having connection withthe inner portion of the larger cylinder when the piston therein is inthe out position, the steam from the inner portion of the largercylinder adapted to flow through said passage to the outer end of thesmaller cylinder to retain the pressure therein.

6. A-locomotive attachment comprising a source of steam, a casing inconnection therewith having large and small cylinders therein 4with apassage establishing communication between the far end of the smallercylinder and both ends of the larger cylinder, pistons in the cylinders,the piston in the larger cylinder moving from one to the other side ofthe connection of the passage with this cylinder, said casing alsohaving an inlet for steam to either side of the piston in the largercylinder according to the position of said piston, means to connect thepistons, a valve opened by said means to deliver steam from' said sourceto the steam chests of a locomotive, and connect-ions between said valveand said piston-connecting means.

7. A locomotive attachment comprising a casing, large and smallcylinders therein, pistons in the cylinders, a rod connecting saidpistons having a valve face, said large cylinder having an outlet at itsproximate end with a seat to receive said valve face, said casing havinga passage connecting said cylinders, said passage connecting with theinner or outer portion of the large cylinder as controlled by theposition of the piston, said larger cylinder being in connection at itsouter end with steam from steam chests of a locomotive, a source ofsteam, said large cylinder also having communication with said source ofsteam at its inner portion when therpiston therein is in the outerposition whereby to furnish steam from said source to said passage tomaintain the pressure in the small cylinder, and means opened by saidpiston rod to deliver steam to the steam chests from the source ofsteam.

8. A locomotive attachment comprising a casing, large and smallcylinders therein, pistons in said cylinders, said large cylinderhavingV ports intermediate thereof put either in connection with theinner or outer part of the cylinder in accordance with the outer` orinner position of the piston respectively, said casing having a passageconnectingone port with the outer end of the small cylinder, avalve insaid passage opening only toward the smaller cylinder, a source ofsteam, means including the other port whereby steam may be introducedfrom said source into the inner portion of the larger cylinder when thepiston therein is in the outer position whereby steam may be furnishedto said passage and to the smaller cylinder Vfor maintaining thepressure therein, means alsowhereby steam may be introduced into theouter portion of the larger cylinder, means connecting said pistons andacting to control the evacuation of the inner part of the large cylinderwhen the piston moves inwardly, means moved by said pistons to causedelivery of steam from said source to said steam chests of thelocomotive, and means for allowing excess pressure in the smallercylinder to escape.

9. A locomotive attachment comprising a casing having an intermediateported chamber in its lower portion and opposed cylinders of unequaldiameter in its upper end portions, pistons in the cylinders moved bythe presence and absence of steam from locomotive steam chests, a rodconnecting said pistons, a turning post journaled to turn through thetop of the chamber and connected for circular movement to said rod, ablock in the casing turned with said pin, and valve shoes carried bysaid block and controlling the ports of the chamber.

l0. A locomotive attachment comprising a casing having means forattaching the same to: a locomotive, a chamber within the central lowerportion of said casing having ports in its sides, said casing havingchannels forming extensions to the ports and opening through the sidesof the casing, said casing also having a passage for furnishing steam tothe chamber, a pair of opposed cylinders at opposite ends of thecasingabove the plane of the chamber, said casing having passages leading fromsaid channels to the outer end of one of said cylinders, said casingfurther having a passage placing the two cylinders in communication, apiston rod connecting said pistons, a valve actuated to turn on therectilinear movement of said rod, said valve being situated in saidchamber and having shoes for controlling said ports in they chamber.

1l. In combination with a locomotive having a source of steam andvalvechests, of an attachment therefor comprising a chamber incommunication separately with Valve means, and means totrap the steampressure against the face of the actuating means having the smaller areawhereby, when the steam chest pressure falls, such accumulated pressurewill act to shift the actuating means in the opposite direction and opensaid valve means.

tures.

RICHARD W. BRADEN. CHARLES STERN.

In testimony whereof we affix our'signa- 20

